Large-diameter shield machine shield body built-in grouting hole rapid sealing device and sealing method

Abstract

The application discloses a quick plugging device and method for a built-in grouting hole of a large-diameter shield machine shield body, and the quick plugging device comprises a plugging seat and a valve part, wherein the plugging seat is provided with a plugging channel; the valve part is communicated with the plugging channel to control opening or closing of the plugging channel; the quick plugging device further comprises a magnetic attraction part, and the magnetic attraction part comprises an electromagnetic coil and an annular magnetic force piece. The application is positioned by the magnetic attraction part, a contact surface formed by the positioning can be fully positioned and attracted on the periphery of the grouting hole, the sealing property of plugging is improved, the probability of plugging failure due to displacement or damage of the plugging seat is avoided, magnetic attraction areas formed on the plugging seat near or far from the grouting hole do not interfere with each other, strong attraction force is provided, and better impact resistance is provided. In addition, the electromagnetic coil is convenient to remove after losing power, and therefore, the plugging efficiency is high and the plugging cost is low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel construction, and particularly relates to a quick plugging device for a built-in grouting hole of a large-diameter shield machine shield body, and also relates to a quick plugging method for a built-in grouting hole of a large-diameter shield machine shield body. BACKGROUND

[0002] At present, with the development of urban underground space, more and more urban underground highway tunnels are built. Since a large shield machine inevitably needs to pass through a large number of buildings and pipelines in the urban center, the requirement for anti-settlement is more stringent than that of a shield machine passing through rivers, lakes and seas. Therefore, in the process of urban construction, in order to meet the needs of passing through important buildings and risk sources, the shield machine usually injects anti-settlement filling materials such as clay and water-resistant materials such as polyurethane around the shield body. Specifically, radial holes are arranged on the shield body of the shield machine, and the conventional radial holes are generally arranged in the middle and front shields in uniform ring direction. After the anti-settlement materials are injected along the shield body, the diameter difference between the cutter head and the shield body is reduced, thereby reducing the settlement risk of important ground structures and ensuring construction safety.

[0003] However, the urban large shield machine is generally buried underground more than 40 meters deep, and faces the risk of injecting materials into the grouting hole of the shield body under high water pressure. Moreover, after the injection is completed, the valve at the grouting hole usually needs to be closed and the pipeline needs to be cleaned in time. The valve connected here is prone to failure under the influence of high water pressure and high-frequency switching at the bottom of the ground, such as the valve connection falling off, the valve being unable to close, etc. If the valve hole position is not closed in time, it may cause a large amount of water seepage in the shield machine, affecting tunnel construction and ground settlement risk, or even cause the shield to be buried and the ground to collapse. In the case of grouting valve failure, wood wedges or cotton quilts and sandbags are generally used for accumulation and plugging. In a high water pressure environment, it is difficult to seal the leakage point in a short time by using such conventional plugging measures, and it is difficult to adjust a large amount of manpower and material resources for operation in a short time in the closed space of the shield machine. Therefore, in the high-frequency radial grouting operation, the grouting hole position in the shield machine has become the weakest part of the shield machine.

[0004] In view of the above leakage problem, a conventional plugging component is directly welded around the grouting hole of the shield body, and then a plugging valve is used to open or close the grouting hole to ensure the grouting or plugging operation of the grouting hole.

[0005] However, the above plugging method has the following technical problems:

[0006] 1) Since the welding means mainly seals the periphery, but the contact part between the plugging component and the shield body is prone to cause diswelding or damage to the plugging component under internal stress, resulting in plugging failure;

[0007] 2) welding sealing method, not only the construction efficiency is low, and the welding technology is high, at the same time, once welding, it is inconvenient to remove, grouting hole and sealing component one to one set, and the sealing component also cannot be reused, therefore, the sealing efficiency is low, and the sealing cost is high. SUMMARY

[0008] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide an improved quick sealing device for built-in grouting holes of a large-diameter shield machine shield body.

[0009] Meanwhile, the present application also relates to a quick sealing method for built-in grouting holes of a large-diameter shield machine shield body.

[0010] A quick sealing device for built-in grouting holes of a large-diameter shield machine shield body, comprising a sealing seat and a valve component, wherein the sealing seat has a sealing channel, the inner diameter of the sealing channel is greater than the diameter of the grouting hole; the valve component is arranged on the sealing seat and communicates with the sealing channel to control the opening or closing of the sealing channel, the quick sealing device further comprises a magnetic attraction component which can be disassembled on the sealing seat, the magnetic attraction component comprises an electromagnetic coil arranged on the sealing seat around the center of the sealing channel, and an annular magnetic force piece arranged concentrically with the electromagnetic coil and distributed along the outer contour of the sealing seat in the circumferential direction, wherein the electromagnetic coil and the annular magnetic force piece are arranged at intervals inside and outside, and the outer diameter of the electromagnetic coil is d1, the outer diameter of the annular magnetic force piece is d2, and the outer diameter of the sealing channel is d3, wherein 0.4d3≤d2-d1≤0.8d3.

[0011] Preferably, the inner diameter of the annular magnetic force piece is d4, and the outer diameter of the sealing seat is d5, wherein 0.5(d4-d1)≤d5-d2≤d4-d1. In this way, the magnetic attraction force distribution on the adsorption surface of the sealing seat attracted to the shield body is uniform, and the deformation of the sealing seat is reduced.

[0012] Preferably, an annular positioning cavity extending in the circumferential direction of the sealing channel is formed in the inside of the sealing seat, and the electromagnetic coil and the annular magnetic force piece are arranged in the positioning cavity respectively; and / or, the side surface of the sealing seat adsorbed on the shield body is further provided with a sealing ring, wherein the sealing ring extends in the circumferential direction of the sealing channel.

[0013] Specifically, the sealing ring is arranged coincidently with the projection of the annular magnetic force piece in the length direction of the sealing channel. In this way, when the annular magnetic force piece assists the sealing seat to adjust the positioning on the shield body, it can extrude the sealing ring to ensure the sealing property during the sealing process.

[0014] Preferably, the blocking seat comprises a bottom plate, a cover plate, a side plate connected between the bottom plate and the cover plate along the length direction of the blocking channel, wherein the bottom plate, the cover plate and the side plate form a positioning cavity therebetween, and the outer side of the bottom plate forms an adsorption surface capable of being attached to the surface of the shield body; the electromagnetic coil is connected to the inner side of the bottom plate; the bottom plate is formed with a first through hole matched with the grouting hole, the cover plate is formed with a second through hole, and the blocking channel communicates the first through hole and the second through hole; and the valve component is fixedly connected to the cover plate and communicates with the blocking channel.

[0015] Further, the inner side of the bottom plate is formed with a first positioning groove matched with the electromagnetic coil and a second positioning groove matched with the annular magnetic force piece, the electromagnetic coil is positioned in the first positioning groove, and the annular magnetic force piece is positioned in the second positioning groove. In this way, the structure is simple, and the disassembly and assembly are convenient.

[0016] Preferably, the cover plate and the side plate are detachably connected; and / or, the cover plate is provided with two handles distributed side by side and spaced apart, and the valve component is located between the two handles. In this way, the installation and disassembly are facilitated.

[0017] Preferably, when the blocking seat is adsorbed on the shield body, the magnetic attraction force formed by the electromagnetic coil in the energized state is F1, and the magnetic attraction force formed by the annular magnetic force piece is F2, wherein 200kgf≤F1≤300kgf, and 30kgf≤F2≤60kgf.

[0018] Preferably, the valve component comprises a valve body and a pipeline communicating the valve body and the blocking channel, wherein the diameter of the pipeline gradually narrows from the blocking channel to the valve body. In this way, the flow of leaked water during pressure relief is increased, and the pressure relief effect is effectively improved, so as to facilitate the installation of the blocking seat.

[0019] Another technical solution of the present application is a quick blocking method for an in-built grouting hole of a large-diameter shield machine, which adopts the quick blocking device described above, and the blocking steps are as follows:

[0020] S1, install the blocking seat on the surface of the shield body where the grouting hole is located, at this time, the adsorption force formed by the annular magnetic force piece adsorbs the blocking seat on the surface of the shield body, and the position of the blocking seat is adjusted so that the blocking channel is aligned with the grouting hole, the port of the grouting hole is located in the port of the aligned blocking channel, and the valve component is opened to release the pressure in the grouting hole;

[0021] S2, the electromagnetic coil is energized, and the magnetic attraction force is formed between the blocking seat and the shield body, so that the blocking seat is adsorbed on the surface of the shield body from the adsorption surface, the valve component is closed, and the blocking of the in-built grouting hole of the shield body is formed, at this time, the grouting pipeline is directly communicated with the valve component, the valve component is opened, the blocking material is injected into the grouting hole through the blocking channel, the electromagnetic coil is de-energized, the quick blocking device is disassembled from the surface of the shield body, or the magnetic attraction component is disassembled from the quick blocking device.

[0022] Due to the implementation of the above technical solutions, the present application has the following advantages compared with the prior art:

[0023] The contact surface formed by the adsorption positioning of the magnetic attraction part can be fully positioned and adsorbed around the grouting hole, improving the sealing performance of the plugging, avoiding the displacement or damage of the plugging seat, and increasing the probability of plugging failure. Meanwhile, the plugging seat near or far from the grouting hole forms a magnetic adsorption area that does not interfere with each other, which not only provides strong adsorption force, but also has better impact resistance. In addition, after the electromagnetic coil loses power, it is convenient to remove, so the plugging efficiency is high and the plugging cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective structural schematic diagram of the quick plugging device adopted by the present application;

[0025] Figure 2 It is a structural schematic diagram (partially sectioned) of the quick plugging device adopted by the present application;

[0026] Figure 3 It is Figure 2 It is a top view schematic diagram of the middle base plate, the electromagnetic coil and the annular magnetic force part;

[0027] Wherein: 1, plugging seat; 10, base plate; k1, first through hole; m, adsorption surface; c1, first positioning groove; c2, second positioning groove; 100, sealing ring; 11, cover plate; 110, handle; k2, second through hole; s, bolt; 12, side plate; t, plugging channel; q, positioning cavity;

[0028] 2, magnetic attraction part; 20, electromagnetic coil; 21, annular magnetic force part; 22, switch; 23, battery;

[0029] 3, valve part; 30, valve body; 31, pipeline. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like are merely used for the purpose of illustration and do not indicate an absolute orientation.

[0036] As shown in the drawings, the large-diameter shield machine shield built-in grouting hole rapid sealing device of the embodiment comprises a sealing seat 1, a magnetic component 2, and a valve component 3. Figures 1 to 3 Specifically, the sealing seat 1 is in a cylindrical shape and has a sealing passage t in communication with the grouting hole on the shield. The inner diameter of the sealing passage t is greater than the diameter of the grouting hole. The sealing seat 1 comprises a bottom plate 10, a cover plate 11, and a side plate 12 arranged in parallel and spaced apart from each other in the up-down direction. The bottom plate 10, the side plate 12, and the sealing passage t are integrally formed. A first through hole k1 matching the grouting hole is formed on the bottom plate 10. A second through hole k2 is formed on the cover plate 11. The sealing passage t is in communication with the first through hole k1 and the second through hole k2. An annular positioning cavity q extending around the sealing passage t is formed between the bottom plate 10, the cover plate 11, and the side plate 12. The magnetic component 2 comprises an electromagnetic coil 20 arranged in the positioning cavity q formed by the sealing seat 1 around the center of the sealing passage t, and an annular magnetic force piece 21 arranged in the positioning cavity q formed by the sealing seat 1 and concentrically arranged with the electromagnetic coil 20 and distributed around the outer contour of the sealing seat 1. The electromagnetic coil 20 is arranged in spaced apart relationship with the annular magnetic force piece 21. The valve component 3 is arranged on the sealing seat 1 and in communication with the sealing passage t to control the opening or closing of the sealing passage t.

[0037] In this embodiment, the bottom surface of the bottom plate 10 forms an adsorbing surface m capable of being attached to the surface of the shield. The inner side of the bottom plate 10 is formed with a first positioning groove c1 matching the electromagnetic coil 20 and a second positioning groove c2 matching the annular magnetic force piece 21. The electromagnetic coil 20 is positioned in the first positioning groove c1, and the annular magnetic force piece 21 is positioned in the second positioning groove c2. In this way, the structure is simple and convenient to disassemble and assemble.

[0038] Further, the sealing ring 100 extending around the circumference of the sealing passage t is arranged on the side surface of the shield (the adsorbing surface m formed on the bottom plate 10) to which the sealing seat 1 is adsorbed. The sealing ring 100 is arranged in overlapping relationship with the projection of the annular magnetic force piece 21 in the length direction of the sealing passage t. In this way, when the annular magnetic force piece assists the sealing seat in adjusting the positioning on the shield, the sealing ring can be squeezed to ensure the sealing property during the sealing process.

[0039] ​

[0040] Specifically, the bottom surface of the bottom plate 10 forms an annular groove, and the sealing ring 100 is embedded in the annular groove.

[0041] In this example, the cover plate 11 is detachably connected to the top of the side plate 12 by a plurality of bolt members s uniformly distributed circumferentially around the blocking channel t.

[0042] At the same time, in order to facilitate implementation, two U-shaped handles 110 are arranged on the cover plate 11 in parallel and spaced apart, and the valve component 3 is arranged on the cover plate 11 and located between the two handles 110. In this way, installation and disassembly are facilitated.

[0043] In this example, the magnetic attraction component 2 further includes a switch 22 and a battery 23, wherein the battery 23 is connected between the top of the electromagnetic coil 20 and the cover plate 11, and the switch 22 is connected to the electromagnetic coil 20 and protrudes upward from the cover plate 11.

[0044] Specifically, the outer diameter of the electromagnetic coil 20 is d1, the outer diameter of the annular magnetic force member 21 is d2, and the outer diameter of the blocking channel t is d3, wherein d2-d1=0.6d3.

[0045] At the same time, the inner diameter of the annular magnetic force member 21 is d4, and the outer diameter of the blocking seat 1 is d5, wherein d5-d2=0.8(d4-d1). In this way, the magnetic attraction force distribution on the adsorption surface of the blocking seat and the shield body is uniform, and the deformation of the blocking seat is reduced.

[0046] When the blocking seat 1 is adsorbed on the shield body, the magnetic attraction force formed by the electromagnetic coil 20 in the energized state is F1, and the magnetic attraction force formed by the annular magnetic force member 21 is F2, wherein 200kgf≤F1≤300kgf, and 30kgf≤F2≤60kgf.

[0047] In addition, the valve component 3 adopts a ball valve and includes a valve body 30 and a pipeline 31 communicating the valve body 30 with the blocking channel t, wherein the pipe diameter of the pipeline 31 gradually narrows from the blocking channel t to the valve body 30. In this way, the flow of leaked water during pressure relief is increased, and the pressure relief effect is effectively improved to facilitate the installation of the blocking seat.

[0048] In summary, the rapid blocking method of the present embodiment includes the following steps:

[0049] S1, the blocking seat 1 is attached to the surface of the shield body circumferentially around the grouting hole from the adsorption surface m, at this time the adsorption force formed by the annular magnetic force member 21 attracts the blocking seat 1 to the surface of the shield body, and assists in adjusting the position of the blocking seat 1 on the shield body, so that the blocking channel t is aligned with the grouting hole, the port of the grouting hole is located in the port aligned with the blocking channel, and the valve component 3 is opened to release the pressure in the grouting hole;

[0050] S2, open the switch 22 to control the electromagnetic coil 20 on the plugging seat 1 power on, the electromagnetic coil 20 between the plugging seat 1 and the shield forms magnetic attraction, so that the plugging seat 1 from the adsorption surface m firmly adsorbed on the surface of the shield, close the valve component 3, form the plugging of the built-in grouting hole of the shield, at this time, the grouting pipeline is directly connected with the valve component 3, open the valve component 3, through the plugging channel t to the grouting hole injection plugging material (polyurethane or double liquid slurry), then turn off the switch 22 to control the electromagnetic coil 20 power off, at this time, the whole quick plugging device can be removed from the surface of the shield or the magnetic attraction component 2 is removed from the quick plugging device with small force.

[0051] In summary, the embodiment has the following advantages:

[0052] 1, through the adsorption positioning of the magnetic attraction component, the contact surface formed can form comprehensive positioning and suction on the periphery of the grouting hole, improve the sealing of the plugging, avoid the displacement or damage of the plugging seat, increase the probability of plugging failure, at the same time, the plugging seat near or far from the grouting hole forms a magnetic attraction area that does not interfere with each other, not only provides strong adsorption force, but also has better impact resistance, in addition, after the electromagnetic coil loses power, it is convenient to remove, therefore, the plugging efficiency is high and the plugging cost is low;

[0053] 2, the electromagnetic coil and the annular magnetic force piece can be removed from the plugging seat, which is simple and labor-saving, so as to be reused and reduce the plugging cost; the projection of the sealing ring and the annular magnetic force piece in the length direction of the plugging channel coincides, so that the annular magnetic force piece can extrude the sealing ring when the plugging seat is adjusted and positioned on the shield, ensuring the sealing property in the plugging process;

[0054] 3, through the interval distribution between the electromagnetic coil, the annular magnetic force piece and the bottom surface of the plugging seat, the magnetic attraction force distribution on the adsorption surface of the plugging seat and the shield is uniform, reducing the deformation of the plugging seat; through the gradually narrowing setting of the pipe diameter of the pipeline on the valve component, the flow of leaked water is increased when pressure relief, effectively improving the pressure relief effect, so as to facilitate the installation of the plugging seat; simple structure, convenient to disassemble and assemble.

[0055] The above has made a detailed description of the present application, the purpose is to let the person who is familiar with this field technology can understand the content of the present application and implement, and cannot limit the protection scope of the present application, any equivalent change or modification according to the spirit of the present application should be covered in the protection scope of the present application.

Claims

1. A large-diameter shield machine shield body built-in grouting hole rapid sealing device, comprising a sealing seat and a valve component, wherein the sealing seat has a sealing channel, the inner diameter of the sealing channel is greater than the diameter of the grouting hole; the valve component is arranged on the sealing seat and communicates with the sealing channel to control the opening or closing of the sealing channel, characterized in that: The quick plugging device further comprises a magnetic attraction component detachably arranged on the plugging seat, the magnetic attraction component comprises an electromagnetic coil arranged on the plugging seat around the center of the plugging channel and an annular magnetic force piece arranged concentrically with the electromagnetic coil and distributed along the outer contour of the plugging seat in the circumferential direction, wherein the electromagnetic coil and the annular magnetic force piece are arranged at intervals inside and outside the annular magnetic force piece, the outer diameter of the electromagnetic coil is d1, the outer diameter of the annular magnetic force piece is d2, and the outer diameter of the plugging channel is d3, wherein 0.4d3≤d2-d1≤0.8d3; The plugging seat is internally formed with an annular positioning cavity extending in the circumferential direction of the plugging channel, and the electromagnetic coil and the annular magnetic force piece are arranged in the positioning cavity, respectively; the plugging seat comprises a bottom plate, a cover plate and a side plate connected between the bottom plate and the cover plate in the length direction of the plugging channel, wherein the positioning cavity is formed between the bottom plate, the cover plate and the side plate, and the outer side of the bottom plate is formed with an adsorption surface capable of being attached to the surface of the shield body; the electromagnetic coil is connected to the inner side of the bottom plate; when the plugging seat is adsorbed on the shield body, the magnetic attraction force formed by the electromagnetic coil in the energized state is F1, and the magnetic attraction force formed by the annular magnetic force piece is F2, wherein 200kgf≤F1≤300kgf and 30kgf≤F2≤60kgf.

2. The quick plugging device for built-in grouting hole of large-diameter shield machine shield body according to claim 1, characterized in that: The inner diameter of the annular magnetic force piece is d4, and the outer diameter of the plugging seat is d5, wherein 0.5(d4-d1)≤d5-d2≤d4-d1.

3. The quick plugging device for built-in grouting hole of large-diameter shield machine shield body according to claim 1, characterized in that: The side surface of the plugging seat adsorbed on the shield body is further provided with a sealing ring, wherein the sealing ring extends around the plugging channel in the circumferential direction.

4. The quick plugging device for built-in grouting hole of large diameter shield machine shield body according to claim 3, characterized in that: The sealing ring is arranged in the projection of the annular magnetic force piece in the length direction of the plugging channel.

5. The quick plugging device for built-in grouting hole of large diameter shield machine shield body according to claim 3, characterized in that: The bottom plate is formed with a first through hole matched with the grouting hole, the cover plate is formed with a second through hole, and the plugging channel communicates the first through hole and the second through hole; the valve component is fixedly connected to the cover plate and communicates with the plugging channel.

6. The quick plugging device for built-in grouting hole of large diameter shield machine shield body according to claim 5, characterized in that: The inner side of the bottom plate is formed with a first positioning groove matched with the electromagnetic coil and a second positioning groove matched with the annular magnetic force piece, the electromagnetic coil is positioned in the first positioning groove, and the annular magnetic force piece is positioned in the second positioning groove.

7. The quick plugging device for built-in grouting hole of large diameter shield machine shield body according to claim 5, characterized in that: The cover plate and the side plate are detachably connected; and / or, the cover plate is provided with two handles distributed side by side at intervals, and the valve component is located between the two handles.

8. The quick plugging device for built-in grouting hole of large-diameter shield machine shield body according to claim 1, characterized in that: The valve component comprises a valve body and a pipeline communicating the valve body and the plugging channel, wherein the diameter of the pipeline gradually narrows from the plugging channel to the valve body.

9. A method for quickly plugging a built-in grouting hole in a large-diameter shield machine shield, characterized in that: The plugging method adopts the quick plugging device according to any one of claims 1-8, and the plugging steps are as follows: S1, the plugging seat is installed on the surface of the shield body where the grouting hole is located, at this time the plugging seat is attracted to the surface of the shield body by the adsorption force formed by the annular magnetic force piece, and the position of the plugging seat is adjusted so that the plugging channel is aligned with the grouting hole, the port of the grouting hole is located in the port of the plugging channel, and the valve component is opened to release the pressure in the grouting hole; S2, the electromagnetic coil is electrified, and the magnetic attraction force is formed between the blocking seat and the shield body, so that the blocking seat is adsorbed on the surface of the shield body from the adsorption surface, the valve part is closed, the blocking of the built-in grouting hole of the shield body is formed, at this time, the grouting pipeline is directly connected with the valve part, the valve part is opened, the blocking material is injected into the grouting hole through the blocking channel, the electromagnetic coil is de-energized, the quick blocking device is detached from the surface of the shield body, or the magnetic attraction part is detached from the quick blocking device.

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